WO2017141616A1 - Equipment for notching steel strip, method for notching steel strip, cold rolling equipment, and cold rolling method - Google Patents
Equipment for notching steel strip, method for notching steel strip, cold rolling equipment, and cold rolling method Download PDFInfo
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- WO2017141616A1 WO2017141616A1 PCT/JP2017/001844 JP2017001844W WO2017141616A1 WO 2017141616 A1 WO2017141616 A1 WO 2017141616A1 JP 2017001844 W JP2017001844 W JP 2017001844W WO 2017141616 A1 WO2017141616 A1 WO 2017141616A1
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- steel strip
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0085—Joining ends of material to continuous strip, bar or sheet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
- B21B2015/0021—Cutting or shearing the product in the rolling direction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0092—Welding in the rolling direction
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Abstract
Provided are equipment for notching a steel strip, a method for notching a steel strip, cold rolling equipment, and a cold rolling method, which enable cold rolling to be performed without causing joint fractures (weld fractures), even in the case of brittle materials/high alloy materials, such as silicon steel sheets or high tensile strength steel sheets, which have a high content of Si or Mn. This notching equipment forms notches in both widthwise edge portions of a steel strip, at the junction between the trailing edge of a preceding steel strip and the leading edge of a trailing steel strip, and is characterized by being provided with: a shearing means for forming first-stage notches by shearing both widthwise edge portions of the steel strip, including said junction; and a grinding means for forming second-stage notches by grinding, at said junction, the end faces of both widthwise edge portions of the steel strip.
Description
本発明は、鋼帯の接合部にノッチングを施すためのノッチング設備、同じくノッチング方法、冷間圧延設備および冷間圧延方法に関する。
The present invention relates to a notching facility for notching a joining portion of a steel strip, a notching method, a cold rolling facility, and a cold rolling method.
鋼帯の冷間圧延工程においては、生産性の向上や歩留りの向上を目的に、先行材（先行鋼帯）の後端と後行材（後行鋼帯）の先端とを接合し、連続的に冷間圧延ラインに供給することが一般的である。これにより、鋼帯の全長にわたり、張力を付与した状態で圧延することが可能になり、鋼帯の先端や後端においても、板厚や形状を高精度に制御することができる。
In the cold rolling process of steel strip, the rear end of the preceding material (leading steel strip) and the front end of the following material (following steel strip) are joined for the purpose of improving productivity and yield. In general, it is generally supplied to a cold rolling line. Thereby, it becomes possible to roll in the state which gave tension over the full length of a steel strip, and sheet thickness and shape can be controlled with high precision also in the front-end | tip and rear end of a steel strip.
冷延鋼帯の高合金化やレーザ溶接機の進歩に伴い、先行材と後行材の接合は、従来のフラッシュバット溶接等に替わって、レーザ溶接で接合されることが主流になりつつあるが、フラッシュバット溶接やレーザ溶接などの溶接手段に関わらず、先行材と後行材の接合部（溶接部）の板幅方向端部（エッジ部）は、先行材と後行材の鋼帯幅の差や位置ずれなどのために、不可避的に幅段差部が形成される。そして、このままの状態で圧延すると、前記幅段差部に応力集中が生じ、溶接部で破断に至る可能性がある。溶接部での破断（溶接部破断）が生じると、冷間圧延ラインを停止せざるを得ないため、生産性を著しく低下させるとともに、ワークロールを交換する必要が生じるため、生産コストの上昇を招く。
With the advancement of high-alloy cold-rolled steel strips and laser welding machines, the joining of leading and trailing materials is becoming the mainstream instead of conventional flash butt welding, etc. However, regardless of the welding means such as flash butt welding or laser welding, the end in the plate width direction (edge part) of the joining part (welded part) of the preceding material and the succeeding material is the steel strip of the preceding material and the succeeding material. A width step portion is inevitably formed due to a difference in width and displacement. And if it rolls in this state, stress concentration will arise in the said width | variety level | step-difference part, and it may lead to a fracture | rupture in a welding part. When breakage occurs at the welded part (welded part breakage), the cold rolling line has to be stopped, so the productivity is significantly reduced and the work roll needs to be replaced. Invite.
特に、近年は、部材の軽量化や特性向上を目的に、冷延鋼帯の薄ゲージ化に対する要求はますます強くなっている。それに伴い、冷間圧延に要求される圧下率は高くなりつつあり、溶接部の破断率が高くなっているのが現状である。
In particular, in recent years, the demand for thinner gauges for cold-rolled steel strips has been increasing for the purpose of reducing the weight and improving the properties of members. Along with this, the reduction ratio required for cold rolling is increasing, and the current state is that the fracture ratio of the welded portion is increased.
そこで、溶接部での破断を防止するために、溶接部の板幅方向端部にノッチ（切り欠き）を形成するノッチングを行ってから圧延することが行われている。また、このノッチングには、鋼帯の板幅端部は突合せ精度なども悪く、溶接が不十分になり、強度が低くなり易いため、強度の低い部分（概ね、板幅端３０ｍｍ程度）を切り落とす狙いもある。
Therefore, in order to prevent breakage at the welded portion, rolling is performed after performing notching for forming a notch (notch) at the end portion in the plate width direction of the welded portion. In addition, the notch notch is not good at the end of the steel strip because of its poor butting accuracy, welding becomes insufficient, and the strength tends to be low. Therefore, the low-strength portion (generally about 30 mm at the width of the plate) is cut off. There is also an aim.
ノッチングの方法としては、例えば、特許文献１に開示されているように、角部を有しない半円形状に、機械的にせん断加工するのが一般的である。ただし、この半円形状のノッチは、外縁の曲率が一律であり、接合部において鋼帯の幅が最も小さくなるため、接合部において最大の応力が発生することになる。
As a notching method, for example, as disclosed in Patent Document 1, it is general to mechanically shear into a semicircular shape having no corners. However, this semicircular notch has a uniform curvature at the outer edge, and the width of the steel strip is the smallest at the joint, so that the maximum stress is generated at the joint.
これに対し、特許文献１の問題点を解消するために、特許文献２には、最大応力発生点が、溶接部以外に位置するように、略等脚台形状にノッチングする方法が開示されている。
On the other hand, in order to solve the problem of Patent Document 1, Patent Document 2 discloses a method of notching in a substantially isosceles trapezoidal shape so that the maximum stress generation point is located other than the welded portion. Yes.
しかしながら、上記のようなノッチング方法では、特に、ＳｉやＭｎの含有量が多い珪素鋼板や高張力鋼板などの脆性材料・高合金材料の冷間圧延においては、十分な効果を発揮できず、冷間圧延における接合部破断（溶接部破断）を十分に防止できていないのが現状である。
However, the notching method as described above cannot exert a sufficient effect particularly in cold rolling of brittle materials and high alloy materials such as silicon steel plates and high-tensile steel plates having a high Si and Mn content. The present situation is that the joint fracture (welded fracture) in the hot rolling cannot be sufficiently prevented.
本発明は、上記のような事情に鑑みてなされたものであり、ＳｉやＭｎの含有量が多い珪素鋼板や高張力鋼板などの脆性材料・高合金材料の場合でも、接合部破断（溶接部破断）を生じることなく冷間圧延することを可能にする、鋼帯のノッチング設備、鋼帯のノッチング方法、冷間圧延設備および冷間圧延方法を提供することを目的としている。
The present invention has been made in view of the circumstances as described above. Even in the case of a brittle material / high alloy material such as a silicon steel plate or a high-tensile steel plate having a high Si or Mn content, An object of the present invention is to provide a steel strip notching facility, a steel strip notching method, a cold rolling facility, and a cold rolling method that enable cold rolling without causing fracture.
本発明者らは、上記目的を達成するため鋭意検討した結果、詳細は後述するが、従来のように、せん断加工で溶接部にノッチングを行った場合、それによって溶接部の板幅方向端部が加工硬化し、これが溶接部破断の原因となることを知見することに到った。そして、そのような溶接部破断を防止するために、溶接部の板幅方向端部に加工硬化個所がほとんど無いノッチを形成することを着想した。具体的には、せん断加工と研削とを組み合わせたノッチング、または、研削によるノッチングである。
As a result of intensive studies to achieve the above object, the present inventors have described later in detail, but when notching the welded part by shearing as in the prior art, the end part in the plate width direction of the welded part thereby. Has been found to be work-hardened, which causes the weld to break. And in order to prevent such a welded part fracture | rupture, it invented to form the notch which hardly has a work hardening part in the board width direction edge part of a welded part. Specifically, it is notching combining shearing and grinding, or notching by grinding.
本発明は、上記の着想に基づいてなされたものであり、以下の特徴を有している。
The present invention has been made based on the above idea and has the following features.
［１］先行鋼帯の後端と後行鋼帯の先端との接合部の鋼帯幅方向両縁部にノッチを形成するノッチング設備であって、当該接合部を含めて鋼帯幅方向両縁部をせん断加工により１段目のノッチを形成するせん断加工手段と、当該接合部の鋼帯幅方向両縁部の端面を研削により２段目のノッチを形成する研削手段とを備えていることを特徴とする鋼帯のノッチング設備。
[1] Notching equipment for forming notches at both edges in the steel strip width direction of the joint between the rear end of the preceding steel strip and the tip of the subsequent steel strip, including both the steel strip width direction including the joint Shearing means for forming a first-stage notch by shearing the edge and grinding means for forming a second-stage notch by grinding the end surfaces of both edges in the steel strip width direction of the joint. Steel strip notching equipment characterized by that.
［２］先行鋼帯の後端と後行鋼帯の先端との接合部の鋼帯幅方向両縁部にノッチを形成するノッチング設備であって、当該接合部を含めて鋼帯幅方向両縁部の端面を研削によりノッチを形成する研削手段を備えていることを特徴とする鋼帯のノッチング設備。
[2] Notching equipment for forming notches at both edges in the steel strip width direction of the joint between the rear end of the preceding steel strip and the tip of the subsequent steel strip, including both the steel strip width direction including the joint A steel strip notching facility comprising grinding means for forming a notch by grinding an end face of an edge.
［３］先行鋼帯の後端と後行鋼帯の先端とを接合した接合部の鋼帯幅方向両縁部にノッチを形成するノッチング方法であって、当該接合部を含めて鋼帯幅方向両縁部をせん断加工することによって１段目のノッチを形成した後、当該接合部の鋼帯幅方向両縁部の端面を研削することによって２段目のノッチを形成することを特徴とする鋼帯のノッチング方法。
[3] A notching method in which notches are formed at both edges in the steel strip width direction of the joint where the rear end of the preceding steel strip and the tip of the subsequent steel strip are joined, and the width of the steel strip including the joint is included. The first step notch is formed by shearing both edges in the direction, and then the second step notch is formed by grinding the end faces of both edges in the steel strip width direction of the joint. Steel strip notching method.
［４］先行鋼帯の後端と後行鋼帯の先端とを接合した接合部の鋼帯幅方向両縁部にノッチを形成するノッチング方法であって、当該接合部を含めて鋼帯幅方向両縁部の端面を研削することによってノッチを形成することを特徴とする鋼帯のノッチング方法。
[4] A notching method in which notches are formed at both edges in the steel strip width direction of the joint where the rear end of the preceding steel strip and the tip of the subsequent steel strip are joined, and the width of the steel strip including the joint is included. A notching method for a steel strip, characterized in that a notch is formed by grinding the end faces of both edges in the direction.
［５］前記［１］または［２］に記載のノッチング設備が設置されていることを特徴とする冷間圧延設備。
[5] A cold rolling facility in which the notching facility according to [1] or [2] is installed.
［６］前記［３］または［４］に記載のノッチング方法を用いてノッチを形成して冷間圧延を行うことを特徴とする冷間圧延方法。
[6] A cold rolling method characterized by forming a notch using the notching method according to [3] or [4] and performing cold rolling.
本発明によれば、ＳｉやＭｎの含有量が多い珪素鋼板や高張力鋼板などの脆性材料・高合金材料の場合でも、接合部破断（溶接部破断）を生じることなく冷間圧延することが可能になる。
According to the present invention, even in the case of a brittle material or a high alloy material such as a silicon steel plate or a high-tensile steel plate having a high Si or Mn content, cold rolling can be performed without causing a joint fracture (weld fracture). It becomes possible.
まず、前述したように、本発明者らが、従来のようにせん断加工で溶接部にノッチングを行った場合、それによって溶接部の板幅方向端部が加工硬化し、これが溶接部破断の原因となることを知見し、そのような溶接部破断を防止するために、溶接部の板幅方向端部に加工硬化個所がほとんど無いノッチを形成するノッチング手法を着想したことについて、詳しく述べる。
First, as described above, when the present inventors have notched the welded part by shearing as in the past, this causes work hardening in the plate width direction end of the welded part, which causes the welded part to break. In order to prevent this kind of breakage of the welded part, it will be described in detail that a notching method for forming a notch having almost no work-hardened portion at the end part in the plate width direction of the welded part will be described in detail.
すなわち、本発明者らは、溶接部で破断に至り易い原因を調査するため、以下に述べる実験室規模の圧延実験を行った。
That is, the present inventors conducted a laboratory-scale rolling experiment described below in order to investigate the cause of the tendency to break at the weld.
供試材として、３．３質量％のＳｉを含有する、板厚２ｍｍの珪素鋼板を用いて、図１に示すように、先行鋼帯１の後端と後行鋼帯２の先端とをレーザ溶接機を用いて接合した材料を用意し、溶接部３の一部を含むようにして、溶接方向に垂直な方向が長辺になる矩形の供試材（圧延評価用供試材）４をせん断加工により切り出し採取した。
Using a silicon steel plate having a thickness of 2 mm containing 3.3% by mass of Si as a test material, as shown in FIG. 1, the rear end of the preceding steel strip 1 and the front end of the subsequent steel strip 2 are Prepare a material joined using a laser welding machine, shear a rectangular specimen (rolling evaluation specimen) 4 having a long side in a direction perpendicular to the welding direction so as to include a part of the weld 3. It was cut out and collected by processing.
この様にして作製した供試材４を、張力を付与することなく、ワークロール径５００ｍｍの圧延機を用い、３パスで総圧下率９０％の冷間圧延を行った。
The sample material 4 produced in this way was cold-rolled with a total rolling reduction of 90% in 3 passes using a rolling mill with a work roll diameter of 500 mm without applying tension.
図２に、得られた冷間圧延後の鋼板の外観を撮影した写真を示す。張力を付与しない場合でも、溶接部（溶接金属部）３でエッジ割れが発生していることが分かる。実生産のように、張力を付与して圧延するタンデム圧延では、このエッジ割れが溶接部破断の起点になると推定される。
FIG. 2 shows a photograph of the appearance of the obtained steel sheet after cold rolling. Even when no tension is applied, it can be seen that edge cracks occur in the welded portion (welded metal portion) 3. In tandem rolling in which tension is applied and rolled as in actual production, it is estimated that this edge crack is the starting point of the weld fracture.
そして、溶接部３をせん断加工した段階、すなわち、冷間圧延する前の段階において、板幅方向端部を板幅方向に切断した断面（エッジ断面）の組織観察と硬さ試験を行った。図３に結果を示す。図３（ａ）はエッジ断面の組織であり、図３（ｂ）はエッジ断面の硬度分布である。このように、溶接部の板幅方向端部がせん断加工により、加工硬化しており、これが、エッジ割れの原因になると推定された。
Then, at the stage where the welded portion 3 was sheared, that is, before the cold rolling, the structure observation and the hardness test of the cross section (edge cross section) cut in the plate width direction end portion were performed. The results are shown in FIG. FIG. 3A shows the structure of the edge cross section, and FIG. 3B shows the hardness distribution of the edge cross section. Thus, the plate width direction end portion of the welded portion was work-hardened by shearing, and this was estimated to cause edge cracking.
そこで、本発明者らは、溶接部の板幅方向端部に加工硬化個所がほとんど無いノッチを形成するノッチング手法について鋭意検討を行い、研削によって溶接部を加工することを試みた。
Therefore, the present inventors have intensively studied a notching method for forming a notch having almost no work-hardened portion at the end portion in the plate width direction of the welded portion, and tried to process the welded portion by grinding.
すなわち、上述の圧延実験において、せん断加工で切り出した圧延評価用供試材４の溶接部を板幅方向に１ｍｍ機械研削により除去してから、上記と同様の冷間圧延を行った。なお、機械研削は、以下の（Ａ）、（Ｂ）でそれぞれ行った。（Ａ）３Ｍ製シリコンカーバイト＃１２０砥石を用いたディスクグラインダー、（Ｂ）富士製砥製＃３６砥石を用いたディスクグラインダー。
That is, in the rolling experiment described above, the welded portion of the specimen for rolling evaluation 4 cut out by shearing was removed by 1 mm mechanical grinding in the plate width direction, and then cold rolling similar to the above was performed. The mechanical grinding was performed in the following (A) and (B). (A) Disc grinder using 3M silicon carbide # 120 grinding wheel, (B) Disc grinder using Fuji grinding # 36 grinding wheel.
図４に、得られた冷間圧延後の鋼板の外観（上記の図２に対応）を示し、図５に、エッジ断面の組織観察と硬さ試験の結果（上記の図３に対応）を示す。（Ａ）＃１２０砥石で研削した場合、エッジ割れは発生せず、エッジ部の加工硬化も認められない。一方、（Ｂ）＃３６砥石で研削した場合、わずかにエッジ割れが発生するとともに、エッジ部が加工硬化していることが観察される。ただし、図２、図３に示したせん断加工のままの場合に比べると、エッジ割れと加工硬化量は大幅に小さくなっている。
FIG. 4 shows the appearance of the obtained steel sheet after cold rolling (corresponding to FIG. 2 above), and FIG. 5 shows the results of the structure observation of the edge cross section and the hardness test (corresponding to FIG. 3 above). Show. (A) When ground with a # 120 grindstone, edge cracks do not occur and work hardening of the edge portion is not recognized. On the other hand, when (B) grinding is performed with a # 36 grindstone, it is observed that edge cracking slightly occurs and that the edge portion is work-hardened. However, the edge cracking and work hardening amount are significantly smaller than in the case of the shearing process shown in FIGS. 2 and 3.
以上のように、溶接部におけるエッジ割れは、せん断加工による溶接部の加工硬化の影響が大きく、研削によって加工硬化部を除去することにより、エッジ割れを防止できることを見出した。
As described above, it has been found that edge cracks in the welded part are greatly affected by work hardening of the welded part by shearing, and edge cracking can be prevented by removing the work hardened part by grinding.
なお、（Ａ）＃１２０砥石を用いて研削した場合は、せん断加工による加工硬化を除去することはできるが、研削能力が低く、上記の実験において、１ｍｍを研削するのに８秒を要した。一方、（Ｂ）＃３６砥石を用いて研削した場合は、研削能力が高く、上記の実験において、１ｍｍを１秒以下で研削できたが、エッジ部が若干加工硬化している。
In addition, (A) When grinding using a # 120 grindstone, work hardening by shearing can be removed, but the grinding ability is low, and in the above experiment, it took 8 seconds to grind 1 mm. . On the other hand, when (B) grinding was performed using a # 36 grindstone, the grinding ability was high, and in the above experiment, 1 mm could be ground in 1 second or less, but the edge portion was slightly work-hardened.
ここで、加工硬化とは、母材部分（板幅端部から２ｍｍ以上内側の部分）のビッカース硬度に比べ、板幅端部のビッカース硬さが５０ＨＶ以上大きくなっている状態を指すものとする。
Here, work hardening refers to a state in which the Vickers hardness at the end of the plate width is 50 HV or higher compared to the Vickers hardness of the base material portion (portion inside 2 mm or more from the end of the plate width). .
以上のことから、重要なことは、溶接部をノッチングした段階、すなわち、冷間圧延する前の段階において、溶接部に加工硬化した個所が無いようにすることであると言える。
From the above, it can be said that what is important is to make sure that there is no work-hardened part in the welded part at the stage where the welded part is notched, that is, before the cold rolling.
次に、本発明の実施形態について述べる。
Next, an embodiment of the present invention will be described.
［実施形態１］
図６は、本発明の実施形態１を示す図である。この実施形態１においては、鋼帯幅方向両縁部をせん断加工するせん断加工手段（せん断加工機等）と、鋼帯幅方向両縁部の端面を研削する研削手段（ディスクグラインダー等）とを備えたノッチング設備が設置されている。そして、図６に示すように、先行鋼帯１と後行鋼帯２の溶接部３の板幅方向端部を含めた所定範囲に対して、せん断加工１１による１段目のノッチングを施して円弧状のノッチを形成した後、溶接部３を含めて溶接部３近傍のみ、加工硬化した部分を研削１２による２段目のノッチングで除去することで、最終的にノッチ１３を形成するようにしている。すなわち、先行鋼帯１と後行鋼帯２の板幅差や鋼帯接合時の幅ずれの影響をなくすための大きなノッチング（１段目のノッチング：１段目のノッチの形成）はせん断加工１１により行い、溶接部の加工硬化部のみを除去する小さなノッチング（２段目のノッチング：２段目のノッチの形成）は研削１２で行っている。 [Embodiment 1]
FIG. 6 is adiagram showing Embodiment 1 of the present invention. In the first embodiment, a shearing means (shearing machine or the like) that shears both edges of the steel strip in the width direction and a grinding means (disc grinder or the like) that grinds end faces of both edges of the steel strip in the width direction. Equipped notching equipment is installed. Then, as shown in FIG. 6, the first step notching by the shearing process 11 is performed on the predetermined range including the end portion in the plate width direction of the welded portion 3 of the preceding steel strip 1 and the subsequent steel strip 2. After forming the arc-shaped notch, only the vicinity of the welded portion 3 including the welded portion 3 is removed by the second-stage notching by grinding 12 so that the notch 13 is finally formed. ing. That is, the large notching (first notch: formation of the first notch) to eliminate the influence of the difference in sheet width between the preceding steel strip 1 and the succeeding steel strip 2 and the width deviation at the time of joining the steel strip is a shearing process. 11, and a small notching (second notching: formation of the second notch) for removing only the work hardened portion of the welded portion is performed by grinding 12.
図６は、本発明の実施形態１を示す図である。この実施形態１においては、鋼帯幅方向両縁部をせん断加工するせん断加工手段（せん断加工機等）と、鋼帯幅方向両縁部の端面を研削する研削手段（ディスクグラインダー等）とを備えたノッチング設備が設置されている。そして、図６に示すように、先行鋼帯１と後行鋼帯２の溶接部３の板幅方向端部を含めた所定範囲に対して、せん断加工１１による１段目のノッチングを施して円弧状のノッチを形成した後、溶接部３を含めて溶接部３近傍のみ、加工硬化した部分を研削１２による２段目のノッチングで除去することで、最終的にノッチ１３を形成するようにしている。すなわち、先行鋼帯１と後行鋼帯２の板幅差や鋼帯接合時の幅ずれの影響をなくすための大きなノッチング（１段目のノッチング：１段目のノッチの形成）はせん断加工１１により行い、溶接部の加工硬化部のみを除去する小さなノッチング（２段目のノッチング：２段目のノッチの形成）は研削１２で行っている。 [Embodiment 1]
FIG. 6 is a
これによって、この実施形態１では、溶接部３の板幅方向端部において、加工硬化した個所がほとんど無いノッチ１３を形成することができ、ＳｉやＭｎの含有量が多い珪素鋼板や高張力鋼板などの脆性材料・高合金材料の場合でも、溶接部破断を発生することなく冷間圧延することが可能になる。
Thereby, in this Embodiment 1, the notch 13 which hardly has the work hardening part can be formed in the board width direction edge part of the welding part 3, and the silicon steel plate and high-tensile steel plate with much content of Si and Mn Even in the case of a brittle material or a high alloy material such as the above, it is possible to perform cold rolling without causing a weld fracture.
［実施形態２］
図７は、本発明の実施形態２を示す図である。この実施形態２においては、鋼帯幅方向両縁部の端面を研削する研削手段（ディスクグラインダー等）を備えたノッチング設備が設置されており、図７に示すように、先行鋼帯１と後行鋼帯２の溶接部３の板幅方向端部を含めた所定範囲に対して、研削１４によって円弧状のノッチ１５を形成している。すなわち、この実施形態２では、ノッチ１５全体を研削１４で形成している。 [Embodiment 2]
FIG. 7 is adiagram showing Embodiment 2 of the present invention. In this Embodiment 2, notching equipment provided with grinding means (disk grinder or the like) for grinding the end faces of both edges of the steel strip width direction is installed. As shown in FIG. An arc-shaped notch 15 is formed by grinding 14 with respect to a predetermined range including the end in the plate width direction of the welded portion 3 of the row steel strip 2. That is, in the second embodiment, the entire notch 15 is formed by grinding 14.
図７は、本発明の実施形態２を示す図である。この実施形態２においては、鋼帯幅方向両縁部の端面を研削する研削手段（ディスクグラインダー等）を備えたノッチング設備が設置されており、図７に示すように、先行鋼帯１と後行鋼帯２の溶接部３の板幅方向端部を含めた所定範囲に対して、研削１４によって円弧状のノッチ１５を形成している。すなわち、この実施形態２では、ノッチ１５全体を研削１４で形成している。 [Embodiment 2]
FIG. 7 is a
これによって、この実施形態２では、溶接部３の板幅方向端部において、加工硬化した個所がほとんど無いノッチ１５を形成することができ、ＳｉやＭｎの含有量が多い珪素鋼板や高張力鋼板などの脆性材料・高合金材料の場合でも、溶接部破断を発生することなく冷間圧延することが可能になる。
Thereby, in this Embodiment 2, the notch 15 which has almost no work-hardened part can be formed in the edge part of the board width direction of the welding part 3, and the silicon steel plate and high-tensile steel plate with much Si and Mn content Even in the case of a brittle material or a high alloy material such as the above, it is possible to perform cold rolling without causing a weld fracture.
なお、上記の実施形態１、２において、エッジ部を加工硬化させずに、研削するには、砥粒の種類や押し付け圧にもよるが、＃８０以上の砥石を用いることが好ましい。
In Embodiments 1 and 2 described above, in order to grind without hardening the edge portion, it is preferable to use a # 80 or higher grindstone, although it depends on the type of abrasive grains and the pressing pressure.
また、冷間圧延ラインの内で鋼帯エッジ部を研削するには、産業用ロボットなどを用いれば、安全かつ短時間に研削が可能である。例えば、安川電機製ＭＯＴＯＭＡＮ－ＭＨ５０ＩＩ（ＭＯＴＯＭＡＮは登録商標）などのロボットにディスクグラインダーを設置して、溶接部を研削するようにすればよい。
Also, in order to grind the steel strip edge in the cold rolling line, it is possible to grind safely and in a short time by using an industrial robot or the like. For example, a disk grinder may be installed in a robot such as MOTOMAN-MH50II (MOTOMAN is a registered trademark) manufactured by Yaskawa Electric to grind the welded portion.
また、上記の実施形態１と実施形態２のどちらを適用するかは、ノッチの形成に許容される時間、設備スペース、設備費等の観点から、適宜、選択すればよい。
Further, which of the first embodiment and the second embodiment is applied may be appropriately selected from the viewpoint of the time allowed for forming the notch, the facility space, the facility cost, and the like.
例えば、冷間圧延工程の能率を維持するためには、短時間でノッチを形成する必要があるからである（鋼帯長さやルーパー能力にもよるが、ノッチングは概ね１０秒以内に完了させることが望ましい）。
For example, in order to maintain the efficiency of the cold rolling process, it is necessary to form a notch in a short time (depending on the steel strip length and looper capacity, the notching should be completed within approximately 10 seconds. Is desirable).
また、本発明において、特許文献１に記載のように半円状にノッチングしても良いし、特許文献２に記載のように略等脚台形状にノッチングしても良い。また、上記以外の形状でも何ら問題なく、本発明においては、ノッチング形状を特に規定するものではない。
In addition, in the present invention, it may be notched in a semicircular shape as described in Patent Document 1, or may be notched in a substantially isosceles trapezoidal shape as described in Patent Document 2. Further, there is no problem with shapes other than those described above, and the notching shape is not particularly defined in the present invention.
さらに付け加えると、通常の低炭素鋼であれば、せん断加工の場合でもエッジ割れは発生しないが、ＳｉやＭｎの含有量が多い珪素鋼板や高張力鋼板などの脆性材料・高合金材料では溶接部の加工性が乏しいため、せん断加工により加工硬化するとエッジ割れが発生し易い。すなわち、通常の低炭素鋼など、せん断加工でもエッジ割れが発生せず、溶接部破断がほとんど発生しない鋼種には、必ずしも本発明を適用する必要はなく、せん断加工では溶接部で破断する脆性材料や高合金材料などの鋼種に適用すべきである。ただし、冷間タンデム圧延機では、珪素鋼板や高張力鋼板の専用ミルである場合もあるが、そうではなく、低炭素鋼なども合わせて圧延する兼用ミルの場合もある。その場合、低炭素鋼にも本発明を適用して何ら問題はない。
In addition, edge cracking does not occur even in the case of shearing with ordinary low-carbon steel, but in brittle materials and high-alloy materials such as silicon steel sheets and high-tensile steel sheets with high Si and Mn contents, Therefore, edge cracking is likely to occur when work hardening is performed by shearing. In other words, it is not always necessary to apply the present invention to a steel type such as ordinary low carbon steel that does not cause edge cracking even in shearing and hardly breaks in the welded part, and the brittle material that breaks in the welded part in shearing. And should be applied to steel grades such as high alloy materials. However, in a cold tandem rolling mill, it may be a dedicated mill for silicon steel plates or high-tensile steel plates, but it may also be a dual-purpose mill for rolling together with low carbon steel. In that case, there is no problem in applying the present invention to low carbon steel.
ちなみに、ＳｉやＭｎの含有量が多い珪素鋼板とは、例えば、Ｓｉ：１．０～６．５質量％、Ｍｎ：０．２～１．０質量％を含有した鋼板であり、ＳｉやＭｎの含有量が多い高張力鋼板とは、例えば、Ｓｉ：１．０～２．０質量％、Ｍｎ：１．５～２０．０質量％を含有し、引張強度が５９０～１４７０ＭＰａの鋼板である。
Incidentally, a silicon steel plate having a large content of Si or Mn is, for example, a steel plate containing Si: 1.0 to 6.5% by mass and Mn: 0.2 to 1.0% by mass. The high-strength steel sheet having a large content of is, for example, a steel sheet containing Si: 1.0 to 2.0 mass%, Mn: 1.5 to 20.0 mass%, and having a tensile strength of 590 to 1470 MPa. .
本発明の実施例として、５スタンドの冷間タンデム圧延機を備えた冷間圧延設備によって珪素鋼板を製造して評価した。
As an example of the present invention, a silicon steel sheet was manufactured and evaluated by a cold rolling facility equipped with a 5-stand cold tandem rolling mill.
その際に、従来例として、溶接部を含めて所定の範囲に対して、せん断加工により半円状にノッチングを行った。
At that time, as a conventional example, a predetermined range including a welded portion was notched in a semicircular shape by shearing.
これに対して、本発明例１として、上記の本発明の実施形態１に基づいてノッチングを行った。すなわち、溶接部を含めて所定の範囲に対して、せん断加工により半円状に１段目のノッチングを行った後、溶接部とその近傍に対して、＃８０砥石を用いて２段目のノッチングとして２ｍｍ研削除去した。
On the other hand, as Example 1 of the present invention, notching was performed based on Embodiment 1 of the present invention described above. That is, after notching the first step in a semicircular shape by a shearing process to a predetermined range including the welded portion, the second step using a # 80 grindstone is applied to the welded portion and the vicinity thereof. As a notching, 2 mm was removed by grinding.
また、本発明例２として、上記の本発明の実施形態２に基づいてノッチングを行った。すなわち、溶接部を含めて所定の範囲に対して、＃３６砥石を用いて研削することで半円状にノッチングを行った。
Further, as Example 2 of the present invention, notching was performed based on the above-described Embodiment 2 of the present invention. That is, a predetermined range including the welded portion was notched in a semicircular shape by grinding with a # 36 grindstone.
いずれの例においても、Ｓｉ含有量が３．１質量％以上３．５質量％未満、板厚１．８ｍｍ以上２．４ｍｍ以下の鋼帯を１００コイル用意し、上記の５スタンドの冷間タンデム圧延機で冷間圧延を行い、板厚０．３ｍｍ以上０．５ｍｍ以下に仕上げた。この際、溶接部での破断発生率を比較した。その結果を図８に示す。
In any example, 100 coils of a steel strip having a Si content of 3.1% by mass to less than 3.5% by mass and a plate thickness of 1.8 mm or more and 2.4 mm or less are prepared. It cold-rolled with the rolling mill and finished to plate thickness 0.3mm or more and 0.5mm or less. At this time, the fracture occurrence rates at the welds were compared. The result is shown in FIG.
図８に示すように、従来例では、溶接部破断の発生率が７％であるのに対し、本発明例１では、溶接部破断を１％まで低下することができ、本発明例２では、溶接部破断を３％まで低下することができた。
As shown in FIG. 8, in the conventional example, the rate of occurrence of weld fracture is 7%, whereas in the present invention example 1, the weld fracture can be reduced to 1%. The weld fracture was reduced to 3%.
これによって、本発明の有効性が確認された。すなわち、先行鋼帯と後行鋼帯との溶接部をノッチングする際に、本発明を適用して、溶接部の板幅方向端部に加工硬化個所がほとんど無いノッチを形成することにより、冷間圧延における溶接部破断を防止することが可能となり、生産性の向上、歩留りの向上を達成することができる。
This confirms the effectiveness of the present invention. That is, when notching the welded portion of the preceding steel strip and the subsequent steel strip, the present invention is applied to form a notch having almost no work-hardening portion at the end portion in the plate width direction of the welded portion. It is possible to prevent welded portion breakage during hot rolling, and it is possible to improve productivity and yield.
１ 先行鋼帯
２ 後行鋼帯
３ 溶接部
４ 圧延評価用供試材
１１ せん断加工
１２ 研削
１３ ノッチ
１４ 研削
１５ ノッチ DESCRIPTION OFSYMBOLS 1 Leading steel strip 2 Subsequent steel strip 3 Welded part 4 Test material for rolling evaluation 11 Shearing 12 Grinding 13 Notch 14 Grinding 15 Notch
２ 後行鋼帯
３ 溶接部
４ 圧延評価用供試材
１１ せん断加工
１２ 研削
１３ ノッチ
１４ 研削
１５ ノッチ DESCRIPTION OF
Claims (6)
- 先行鋼帯の後端と後行鋼帯の先端との接合部の鋼帯幅方向両縁部にノッチを形成するノッチング設備であって、当該接合部を含めて鋼帯幅方向両縁部をせん断加工により１段目のノッチを形成するせん断加工手段と、当該接合部の鋼帯幅方向両縁部の端面を研削により２段目のノッチを形成する研削手段とを備えていることを特徴とする鋼帯のノッチング設備。 A notching facility that forms notches at both edges of the steel strip width direction at the joint between the rear end of the preceding steel strip and the front end of the subsequent steel strip, and includes both edges of the steel strip width direction including the joint. A shearing means for forming a first-stage notch by shearing; and a grinding means for forming a second-stage notch by grinding the end faces of both edges in the steel strip width direction of the joint. Steel strip notching equipment.
- 先行鋼帯の後端と後行鋼帯の先端との接合部の鋼帯幅方向両縁部にノッチを形成するノッチング設備であって、当該接合部を含めて鋼帯幅方向両縁部の端面を研削によりノッチを形成する研削手段を備えていることを特徴とする鋼帯のノッチング設備。 A notching facility for forming notches at both edges in the steel strip width direction of the joint between the rear end of the preceding steel strip and the tip of the subsequent steel strip, including the joint, A steel strip notching facility comprising grinding means for forming a notch by grinding an end face.
- 先行鋼帯の後端と後行鋼帯の先端とを接合した接合部の鋼帯幅方向両縁部にノッチを形成するノッチング方法であって、当該接合部を含めて鋼帯幅方向両縁部をせん断加工することによって１段目のノッチを形成した後、当該接合部の鋼帯幅方向両縁部の端面を研削することによって２段目のノッチを形成することを特徴とする鋼帯のノッチング方法。 A notching method for forming notches at both edges of a steel strip width direction of a joint portion where a rear end of a preceding steel strip and a tip end of a subsequent steel strip are joined, and both edges of the steel strip width direction including the joint portion. Forming a first-stage notch by shearing the portion, and then forming a second-stage notch by grinding the end surfaces of both edges of the joint in the width direction of the steel strip Notching method.
- 先行鋼帯の後端と後行鋼帯の先端とを接合した接合部の鋼帯幅方向両縁部にノッチを形成するノッチング方法であって、当該接合部を含めて鋼帯幅方向両縁部の端面を研削することによってノッチを形成することを特徴とする鋼帯のノッチング方法。 A notching method for forming notches at both edges of a steel strip width direction of a joint portion where a rear end of a preceding steel strip and a tip end of a subsequent steel strip are joined, and both edges of the steel strip width direction including the joint portion. A notching method for a steel strip, characterized in that a notch is formed by grinding an end face of a portion.
- 請求項１または２に記載のノッチング設備が設置されていることを特徴とする冷間圧延設備。 A cold rolling facility in which the notching facility according to claim 1 or 2 is installed.
- 請求項３または４に記載のノッチング方法を用いてノッチを形成して冷間圧延を行うことを特徴とする冷間圧延方法。 A cold rolling method, wherein notching is formed using the notching method according to claim 3 or 4, and cold rolling is performed.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US16/077,784 US11065658B2 (en) | 2016-02-17 | 2017-01-20 | Notching equipment for steel strip, method of notching steel strip, cold rolling facility, and method of cold rolling |
| CN201780011845.2A CN108698096B (en) | 2016-02-17 | 2017-01-20 | Steel strip notching device, steel strip notching method, cold rolling device and cold rolling method |
| KR1020187023176A KR102288554B1 (en) | 2016-02-17 | 2017-01-20 | Steel strip notching equipment, steel strip notching method, cold rolling equipment and cold rolling method |
| RU2018129926A RU2701799C1 (en) | 2016-02-17 | 2017-01-20 | Equipment for production of cuts in steel strip, method for production of cuts in steel strip, technical equipment for cold rolling and method of cold rolling |
| EP17752880.9A EP3395459B1 (en) | 2016-02-17 | 2017-01-20 | Equipment for notching steel strip, method for notching steel strip, cold rolling equipment, and cold rolling method |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016027855A JP6164315B1 (en) | 2016-02-17 | 2016-02-17 | Steel strip notching equipment, steel strip notching method, cold rolling equipment and cold rolling method |
| JP2016-027855 | 2016-02-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2017141616A1 true WO2017141616A1 (en) | 2017-08-24 |
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| PCT/JP2017/001844 WO2017141616A1 (en) | 2016-02-17 | 2017-01-20 | Equipment for notching steel strip, method for notching steel strip, cold rolling equipment, and cold rolling method |
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| US (1) | US11065658B2 (en) |
| EP (1) | EP3395459B1 (en) |
| JP (1) | JP6164315B1 (en) |
| KR (1) | KR102288554B1 (en) |
| CN (1) | CN108698096B (en) |
| RU (1) | RU2701799C1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021106543A1 (en) * | 2019-11-25 | 2021-06-03 | Ｊｆｅスチール株式会社 | Steel strip notching method, cold rolling method, and cold rolled steel strip manufacturing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108188176B (en) * | 2017-12-28 | 2019-04-23 | 武汉钢铁有限公司 | A kind of hot rolled silicon steel band production method |
| CN109048374B (en) * | 2018-09-27 | 2020-11-03 | 浙江华赢特钢科技有限公司 | Silicon steel sheet integrated forming equipment and technological process |
| KR102218418B1 (en) * | 2019-12-02 | 2021-02-19 | 주식회사 포스코 | Strip treating apparatus |
| CN113996664B (en) * | 2021-11-19 | 2024-04-12 | 承德建龙特殊钢有限公司 | Broken roller way device after flying shears and application thereof |
| CN115069732B (en) * | 2022-05-30 | 2023-06-16 | 浙江谋皮环保科技有限公司 | Brush strip separation and recovery method |
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| JP2006341276A (en) * | 2005-06-09 | 2006-12-21 | Jp Steel Plantech Co | Method and facilities for continuous rolling |
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| SU1547886A1 (en) | 1987-07-17 | 1990-03-07 | Московский институт стали и сплавов | Welded billet for sheet rolling |
| JPH0576911A (en) * | 1991-09-17 | 1993-03-30 | Sumitomo Metal Ind Ltd | Method and device for notching steel sheet |
| JPH11169942A (en) * | 1997-12-03 | 1999-06-29 | Kawasaki Steel Corp | Build-up line for stainless steel strip |
| CN101357436B (en) | 2007-07-30 | 2010-10-13 | 州巧科技股份有限公司 | Manufacturing method of combined frame and stamping device thereof |
| JP5889755B2 (en) * | 2012-09-06 | 2016-03-22 | 株式会社神戸製鋼所 | Method for notching strip steel plate and cold rolling method for strip steel plate |
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- 2016-02-17 JP JP2016027855A patent/JP6164315B1/en active Active
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Patent Citations (2)
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| JP2000280093A (en) * | 1999-03-30 | 2000-10-10 | Kawasaki Steel Corp | Method and device for grinding steel belt weld part |
| JP2006341276A (en) * | 2005-06-09 | 2006-12-21 | Jp Steel Plantech Co | Method and facilities for continuous rolling |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021106543A1 (en) * | 2019-11-25 | 2021-06-03 | Ｊｆｅスチール株式会社 | Steel strip notching method, cold rolling method, and cold rolled steel strip manufacturing method |
| TWI758958B (en) * | 2019-11-25 | 2022-03-21 | 日商杰富意鋼鐵股份有限公司 | Grooving method of steel strip, cold rolling method and manufacturing method of cold rolled steel strip |
| EP4043113A4 (en) * | 2019-11-25 | 2022-11-23 | JFE Steel Corporation | Steel strip notching method, cold rolling method, and cold rolled steel strip manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3395459A1 (en) | 2018-10-31 |
| EP3395459B1 (en) | 2020-11-18 |
| EP3395459A4 (en) | 2019-02-13 |
| KR102288554B1 (en) | 2021-08-10 |
| RU2701799C1 (en) | 2019-10-01 |
| CN108698096A (en) | 2018-10-23 |
| TW201736015A (en) | 2017-10-16 |
| KR20180102143A (en) | 2018-09-14 |
| CN108698096B (en) | 2020-06-09 |
| US20200030862A1 (en) | 2020-01-30 |
| JP6164315B1 (en) | 2017-07-19 |
| US11065658B2 (en) | 2021-07-20 |
| JP2017144467A (en) | 2017-08-24 |
| TWI634957B (en) | 2018-09-11 |
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